diff --git a/monasca_api/common/repositories/model/sub_alarm_definition.py b/monasca_api/common/repositories/model/sub_alarm_definition.py
index 5bfe77994..cb50f5814 100644
--- a/monasca_api/common/repositories/model/sub_alarm_definition.py
+++ b/monasca_api/common/repositories/model/sub_alarm_definition.py
@@ -48,7 +48,7 @@ class SubAlarmDefinition(object):
             self.period = row['period']
             self.periods = row['periods']
             self.threshold = row['threshold']
-            self.deterministic = str(row['is_deterministic']) == '1'
+            self.deterministic = row['is_deterministic']
 
         if sub_expr:
             # id is not used for compare or hash.
diff --git a/monasca_api/tests/test_ad_repository.py b/monasca_api/tests/test_ad_repository.py
index 123f8b1bf..fa2bb156c 100644
--- a/monasca_api/tests/test_ad_repository.py
+++ b/monasca_api/tests/test_ad_repository.py
@@ -32,7 +32,7 @@ ALARM_DEF_123_FIELDS = {'actions_enabled': False,
                         'alarm_actions': u'29387234,77778687',
                         'description': None,
                         'expression': u'AVG(hpcs.compute{flavor_id=777, '
-                        'image_id=888, metric_name=cpu, device=1}) > 10',
+                        'image_id=888, metric_name=cpu, device=1},deterministic) > 10',
                         'id': u'123',
                         'match_by': u'flavor_id,image_id',
                         'name': u'90% CPU',
@@ -134,7 +134,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                              'name': '90% CPU',
                              'severity': 'LOW',
                              'expression': 'AVG(hpcs.compute{flavor_id=777,'
-                             ' image_id=888, metric_name=cpu, device=1}) > 10',
+                             ' image_id=888, metric_name=cpu, device=1},deterministic) > 10',
                              'match_by': 'flavor_id,image_id',
                              'actions_enabled': False,
                              'created_at': datetime.datetime.now(),
@@ -161,7 +161,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                               'threshold': 10,
                               'period': 60,
                               'periods': 1,
-                              'is_deterministic': False,
+                              'is_deterministic': True,
                               'created_at': datetime.datetime.now(),
                               'updated_at': datetime.datetime.now()},
                              {'id': '222',
@@ -380,7 +380,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                      'alarm_actions': '29387234,77778687',
                      'description': None,
                      'expression': 'AVG(hpcs.compute{flavor_id=777, '
-                     'image_id=888, metric_name=cpu, device=1}) > 10',
+                     'image_id=888, metric_name=cpu, device=1},deterministic) > 10',
                      'id': '123',
                      'match_by': 'flavor_id,image_id',
                      'name': '90% CPU',
@@ -408,7 +408,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                      'alarm_actions': '29387234,77778687',
                      'description': None,
                      'expression': 'AVG(hpcs.compute{flavor_id=777, '
-                     'image_id=888, metric_name=cpu, device=1}) > 10',
+                     'image_id=888, metric_name=cpu, device=1},deterministic) > 10',
                      'id': '123',
                      'match_by': 'flavor_id,image_id',
                      'name': '90% CPU',
@@ -504,7 +504,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                     'alarm_actions': '29387234,77778687',
                     'description': None,
                     'expression': 'AVG(hpcs.compute{flavor_id=777, '
-                    'image_id=888, metric_name=cpu, device=1}) > 10',
+                    'image_id=888, metric_name=cpu, device=1},deterministic) > 10',
                     'id': '123',
                     'match_by': 'flavor_id,image_id',
                     'name': '90% CPU',
@@ -531,7 +531,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                      'operator': 'GT',
                      'period': 60,
                      'periods': 1,
-                     'is_deterministic': False,
+                     'is_deterministic': True,
                      'threshold': 10.0}]
 
         self.assertEqual(len(sub_alarms), len(expected))
@@ -594,7 +594,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                     'alarm_actions': '29387234,77778687',
                     'description': None,
                     'expression': 'AVG(hpcs.compute{flavor_id=777, '
-                    'image_id=888, metric_name=cpu, device=1}) > 10',
+                    'image_id=888, metric_name=cpu, device=1},deterministic) > 10',
                     'id': '123',
                     'match_by': 'flavor_id,image_id',
                     'name': '90% CPU',
@@ -614,7 +614,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                      'alarm_actions': '29387234,77778687',
                      'description': None,
                      'expression': 'AVG(hpcs.compute{flavor_id=777, '
-                     'image_id=888, metric_name=cpu, device=1}) > 10',
+                     'image_id=888, metric_name=cpu, device=1},deterministic) > 10',
                      'id': '123',
                      'match_by': 'flavor_id,image_id',
                      'name': '90% CPU',
@@ -677,7 +677,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                      'alarm_actions': '29387234,77778687',
                      'description': None,
                      'expression': 'AVG(hpcs.compute{flavor_id=777, '
-                     'image_id=888, metric_name=cpu, device=1}) > 10',
+                     'image_id=888, metric_name=cpu, device=1},deterministic) > 10',
                      'id': '123',
                      'match_by': 'flavor_id,image_id',
                      'name': '90% CPU',
@@ -707,7 +707,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                      'alarm_actions': '29387234,77778687',
                      'description': None,
                      'expression': 'AVG(hpcs.compute{flavor_id=777, '
-                     'image_id=888, metric_name=cpu, device=1}) > 10',
+                     'image_id=888, metric_name=cpu, device=1},deterministic) > 10',
                      'id': '123',
                      'match_by': 'flavor_id,image_id',
                      'name': '90% CPU',
@@ -732,7 +732,7 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
                      'alarm_actions': '29387234,77778687',
                      'description': None,
                      'expression': 'AVG(hpcs.compute{flavor_id=777, '
-                     'image_id=888, metric_name=cpu, device=1}) > 10',
+                     'image_id=888, metric_name=cpu, device=1},deterministic) > 10',
                      'id': '123',
                      'match_by': 'flavor_id,image_id',
                      'name': '90% CPU',
@@ -820,6 +820,10 @@ class TestAlarmDefinitionRepoDB(base.BaseTestCase):
     def test_should_patch_expression_threshold_change(self):
         self.run_patch_test(expression=ALARM_DEF_123_FIELDS['expression'].replace(' 10', ' 20'))
 
+    def test_should_patch_expression_deterministic_change(self):
+        self.run_patch_test(expression=ALARM_DEF_123_FIELDS['expression'].replace(',deterministic',
+                                                                                  ''))
+
     def test_should_patch_expression_function_change(self):
         self.run_patch_test(expression=ALARM_DEF_123_FIELDS['expression'].replace('AVG', 'MAX'))